1167 lines
43 KiB
C++
1167 lines
43 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2017 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************
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*
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* Initially developed by Sandro Santilli <strk@keybit.net> for CartoDB
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*
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*****************************************************************************/
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#include "../postgis/connection_manager.hpp"
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#include "../postgis/asyncresultset.hpp"
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#include "pgraster_datasource.hpp"
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#include "pgraster_featureset.hpp"
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// mapnik
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#include <mapnik/debug.hpp>
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#include <mapnik/global.hpp> // for byte
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#include <mapnik/boolean.hpp>
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#include <mapnik/sql_utils.hpp>
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#include <mapnik/util/conversions.hpp>
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#include <mapnik/timer.hpp>
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#include <mapnik/value/types.hpp>
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#pragma GCC diagnostic push
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#include <mapnik/warning_ignore.hpp>
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#include <boost/algorithm/string.hpp>
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#pragma GCC diagnostic pop
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// stl
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#include <cfloat> // FLT_MAX
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#include <string>
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#include <algorithm>
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#include <set>
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#include <sstream>
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DATASOURCE_PLUGIN(pgraster_datasource)
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const std::string pgraster_datasource::RASTER_COLUMNS = "raster_columns";
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const std::string pgraster_datasource::RASTER_OVERVIEWS = "raster_overviews";
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const std::string pgraster_datasource::SPATIAL_REF_SYS = "spatial_ref_system";
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using std::shared_ptr;
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using mapnik::attribute_descriptor;
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using mapnik::sql_utils::identifier;
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using mapnik::sql_utils::literal;
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using mapnik::value_integer;
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pgraster_datasource::pgraster_datasource(parameters const& params)
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: datasource(params),
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table_(*params.get<std::string>("table", "")),
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raster_table_(*params.get<std::string>("raster_table", "")),
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raster_field_(*params.get<std::string>("raster_field", "")),
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key_field_(*params.get<std::string>("key_field", "")),
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cursor_fetch_size_(*params.get<mapnik::value_integer>("cursor_size", 0)),
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row_limit_(*params.get<value_integer>("row_limit", 0)),
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type_(datasource::Raster),
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srid_(*params.get<value_integer>("srid", 0)),
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band_(*params.get<value_integer>("band", 0)),
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extent_initialized_(false),
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prescale_rasters_(*params.get<mapnik::boolean_type>("prescale_rasters", false)),
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use_overviews_(*params.get<mapnik::boolean_type>("use_overviews", false)),
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clip_rasters_(*params.get<mapnik::boolean_type>("clip_rasters", false)),
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desc_(*params.get<std::string>("type"), "utf-8"),
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creator_(params),
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re_tokens_("!(@?\\w+)!"), // matches !mapnik_var! or !@user_var!
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pool_max_size_(*params_.get<value_integer>("max_size", 10)),
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persist_connection_(*params.get<mapnik::boolean_type>("persist_connection", true)),
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extent_from_subquery_(*params.get<mapnik::boolean_type>("extent_from_subquery", false)),
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estimate_extent_(*params.get<mapnik::boolean_type>("estimate_extent", false)),
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max_async_connections_(*params_.get<value_integer>("max_async_connection", 1)),
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asynchronous_request_(false),
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// params below are for testing purposes only and may be removed at any time
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intersect_min_scale_(*params.get<value_integer>("intersect_min_scale", 0)),
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intersect_max_scale_(*params.get<value_integer>("intersect_max_scale", 0))
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{
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#ifdef MAPNIK_STATS
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mapnik::progress_timer __stats__(std::clog, "pgraster_datasource::init");
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#endif
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if (table_.empty())
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{
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throw mapnik::datasource_exception("Pgraster Plugin: missing <table> parameter");
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}
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boost::optional<std::string> ext = params.get<std::string>("extent");
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if (ext && !ext->empty())
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{
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extent_initialized_ = extent_.from_string(*ext);
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}
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// NOTE: In multithread environment, pool_max_size_ should be
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// max_async_connections_ * num_threads
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if(max_async_connections_ > 1)
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{
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if(max_async_connections_ > pool_max_size_)
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{
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std::ostringstream err;
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err << "PostGIS Plugin: Error: 'max_async_connections ("
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<< max_async_connections_ << ") must be <= max_size(" << pool_max_size_ << ")";
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throw mapnik::datasource_exception(err.str());
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}
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asynchronous_request_ = true;
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}
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boost::optional<value_integer> initial_size = params.get<value_integer>("initial_size", 1);
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boost::optional<mapnik::boolean_type> autodetect_key_field = params.get<mapnik::boolean_type>("autodetect_key_field", false);
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ConnectionManager::instance().registerPool(creator_, *initial_size, pool_max_size_);
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CnxPool_ptr pool = ConnectionManager::instance().getPool(creator_.id());
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if (!pool) return;
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shared_ptr<Connection> conn = pool->borrowObject();
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if (!conn) return;
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if (conn->isOK())
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{
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desc_.set_encoding(conn->client_encoding());
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if (raster_table_.empty())
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{
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mapnik::sql_utils::table_from_sql
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(table_, parsed_schema_, parsed_table_);
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// non-trivial subqueries (having no FROM) make it
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// impossible to use overviews
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// TODO: improve "table_from_sql" ?
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auto nsp = table_.find_first_not_of(" \t\r\n");
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if (nsp != std::string::npos && table_[nsp] == '(')
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{
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if ( use_overviews_ )
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{
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std::ostringstream err;
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err << "Pgraster Plugin: overviews cannot be used "
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"with non-trivial subqueries";
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MAPNIK_LOG_WARN(pgraster) << err.str();
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use_overviews_ = false;
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}
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if ( ! extent_from_subquery_ ) {
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std::ostringstream err;
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err << "Pgraster Plugin: extent can only be computed "
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"from subquery as we could not found table source";
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MAPNIK_LOG_WARN(pgraster) << err.str();
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extent_from_subquery_ = true;
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}
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}
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}
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else
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{
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mapnik::sql_utils::table_from_sql
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(raster_table_, parsed_schema_, parsed_table_);
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}
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// If we do not know either the raster_field or the srid or we
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// want to use overviews but do not know about schema, or
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// no extent was specified, then attempt to fetch the missing
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// information from a raster_columns entry.
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//
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// This will return no records if we are querying a bogus table returned
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// from the simplistic table parsing in table_from_sql() or if
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// the table parameter references a table, view, or subselect not
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// registered in the raster_columns.
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//
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geometryColumn_ = mapnik::sql_utils::unquote_copy('"', raster_field_);
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if (!parsed_table_.empty() && (
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geometryColumn_.empty() || srid_ == 0 ||
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(parsed_schema_.empty() && use_overviews_) ||
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! extent_initialized_
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))
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{
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#ifdef MAPNIK_STATS
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mapnik::progress_timer __stats2__(std::clog, "pgraster_datasource::init(get_srid_and_geometry_column)");
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#endif
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std::ostringstream s;
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try
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{
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s << "SELECT r_raster_column col, srid, r_table_schema";
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if ( ! extent_initialized_ ) {
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s << ", st_xmin(extent) xmin, st_ymin(extent) ymin"
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<< ", st_xmax(extent) xmax, st_ymax(extent) ymax";
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}
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s << " FROM " << RASTER_COLUMNS
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<< " WHERE r_table_name=" << literal(parsed_table_);
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if (!parsed_schema_.empty())
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{
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s << " AND r_table_schema=" << literal(parsed_schema_);
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}
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if (!geometryColumn_.empty())
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{
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s << " AND r_raster_column=" << literal(geometryColumn_);
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}
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MAPNIK_LOG_DEBUG(pgraster) <<
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"pgraster_datasource: running query " << s.str();
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shared_ptr<ResultSet> rs = conn->executeQuery(s.str());
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if (rs->next())
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{
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geometryColumn_ = rs->getValue("col");
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if ( ! extent_initialized_ )
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{
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double lox, loy, hix, hiy;
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if (mapnik::util::string2double(rs->getValue("xmin"), lox) &&
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mapnik::util::string2double(rs->getValue("ymin"), loy) &&
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mapnik::util::string2double(rs->getValue("xmax"), hix) &&
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mapnik::util::string2double(rs->getValue("ymax"), hiy))
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{
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extent_.init(lox, loy, hix, hiy);
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extent_initialized_ = true;
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MAPNIK_LOG_DEBUG(pgraster) << "pgraster_datasource: Layer extent=" << extent_;
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}
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else
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{
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MAPNIK_LOG_DEBUG(pgraster) << "pgraster_datasource: Could not determine extent from query: " << s.str();
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}
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}
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if (srid_ == 0)
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{
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const char* srid_c = rs->getValue("srid");
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if (srid_c != nullptr)
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{
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int result = 0;
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const char * end = srid_c + std::strlen(srid_c);
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if (mapnik::util::string2int(srid_c, end, result))
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{
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srid_ = result;
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}
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}
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}
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if (parsed_schema_.empty())
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{
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parsed_schema_ = rs->getValue("r_table_schema");
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}
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}
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else
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{
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MAPNIK_LOG_DEBUG(pgraster) << "pgraster_datasource: no response from metadata query " << s.str();
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}
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rs->close();
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}
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catch (mapnik::datasource_exception const& ex) {
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// let this pass on query error and use the fallback below
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MAPNIK_LOG_WARN(pgraster) << "pgraster_datasource: metadata query failed: " << ex.what();
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}
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// If we still do not know the srid then we can try to fetch
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// it from the 'table_' parameter, which should work even if it is
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// a subselect as long as we know the raster_field to query
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if (! geometryColumn_.empty() && srid_ <= 0)
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{
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s.str("");
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s << "SELECT ST_SRID(" << identifier(geometryColumn_)
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<< ") AS srid FROM " << populate_tokens(table_)
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<< " WHERE " << identifier(geometryColumn_)
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<< " IS NOT NULL LIMIT 1";
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shared_ptr<ResultSet> rs = conn->executeQuery(s.str());
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if (rs->next())
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{
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const char* srid_c = rs->getValue("srid");
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if (srid_c != nullptr)
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{
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int result = 0;
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const char * end = srid_c + std::strlen(srid_c);
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if (mapnik::util::string2int(srid_c, end, result))
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{
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srid_ = result;
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}
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}
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}
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rs->close();
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}
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}
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// If overviews were requested, take note of the max scale
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// of each available overview, sorted by scale descending
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if ( use_overviews_ )
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{
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std::ostringstream err;
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if (parsed_schema_.empty())
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{
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err << "Pgraster Plugin: unable to lookup available table"
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<< " overviews due to unknown schema";
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throw mapnik::datasource_exception(err.str());
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}
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if (geometryColumn_.empty())
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{
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err << "Pgraster Plugin: unable to lookup available table"
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<< " overviews due to unknown column name";
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throw mapnik::datasource_exception(err.str());
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}
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std::ostringstream s;
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s << "select "
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"r.r_table_schema sch, "
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"r.r_table_name tab, "
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"r.r_raster_column col, "
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"greatest(abs(r.scale_x), abs(r.scale_y)) scl "
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"from"
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" raster_overviews o,"
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" raster_columns r "
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"where"
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" o.r_table_schema = " << literal(parsed_schema_)
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<< " and o.r_table_name = " << literal(parsed_table_)
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<< " and o.r_raster_column = " << literal(geometryColumn_)
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<< " and r.r_table_schema = o.o_table_schema"
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" and r.r_table_name = o.o_table_name"
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" and r.r_raster_column = o.o_raster_column"
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" ORDER BY scl ASC";
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MAPNIK_LOG_DEBUG(pgraster) << "pgraster_datasource: running query " << s.str();
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shared_ptr<ResultSet> rs = conn->executeQuery(s.str());
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while (rs->next())
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{
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pgraster_overview ov = pgraster_overview();
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ov.schema = rs->getValue("sch");
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ov.table = rs->getValue("tab");
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ov.column = rs->getValue("col");
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ov.scale = atof(rs->getValue("scl"));
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if(ov.scale == 0.0f)
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{
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MAPNIK_LOG_WARN(pgraster) << "pgraster_datasource: found invalid overview "
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<< ov.schema << "." << ov.table << "." << ov.column << " with scale " << ov.scale;
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continue;
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}
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overviews_.push_back(ov);
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MAPNIK_LOG_DEBUG(pgraster) << "pgraster_datasource: found overview "
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<< ov.schema << "." << ov.table << "." << ov.column << " with scale " << ov.scale;
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}
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rs->close();
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if ( overviews_.empty() ) {
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MAPNIK_LOG_DEBUG(pgraster) << "pgraster_datasource: no overview found for "
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<< parsed_schema_ << "." << parsed_table_ << "." << geometryColumn_;
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}
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}
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// detect primary key
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if (*autodetect_key_field && key_field_.empty())
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{
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#ifdef MAPNIK_STATS
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mapnik::progress_timer __stats2__(std::clog, "pgraster_datasource::bind(get_primary_key)");
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#endif
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std::ostringstream s;
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s << "SELECT a.attname, a.attnum, t.typname, t.typname in ('int2','int4','int8') "
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"AS is_int FROM pg_class c, pg_attribute a, pg_type t, pg_namespace n, pg_index i "
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"WHERE a.attnum > 0 AND a.attrelid = c.oid "
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"AND a.atttypid = t.oid AND c.relnamespace = n.oid "
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"AND c.oid = i.indrelid AND i.indisprimary = 't' "
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"AND t.typname !~ '^geom' AND c.relname = " << literal(parsed_table_) << " "
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//"AND a.attnum = ANY (i.indkey) " // postgres >= 8.1
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<< "AND (i.indkey[0]=a.attnum OR i.indkey[1]=a.attnum OR i.indkey[2]=a.attnum "
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"OR i.indkey[3]=a.attnum OR i.indkey[4]=a.attnum OR i.indkey[5]=a.attnum "
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"OR i.indkey[6]=a.attnum OR i.indkey[7]=a.attnum OR i.indkey[8]=a.attnum "
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"OR i.indkey[9]=a.attnum) ";
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if (!parsed_schema_.empty())
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{
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s << "AND n.nspname=" << literal(parsed_schema_) << ' ';
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}
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s << "ORDER BY a.attnum";
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shared_ptr<ResultSet> rs_key = conn->executeQuery(s.str());
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if (rs_key->next())
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{
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unsigned int result_rows = rs_key->size();
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if (result_rows == 1)
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{
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bool is_int = (std::string(rs_key->getValue(3)) == "t");
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if (is_int)
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{
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const char* key_field_string = rs_key->getValue(0);
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if (key_field_string)
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{
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key_field_ = std::string(key_field_string);
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MAPNIK_LOG_DEBUG(pgraster) << "pgraster_datasource: auto-detected key field of '"
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<< key_field_ << "' on table '" << parsed_table_ << "'";
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}
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}
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else
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{
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// throw for cases like a numeric primary key, which is invalid
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// as it should be floating point (int numerics are useless)
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std::ostringstream err;
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err << "PostGIS Plugin: Error: '"
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<< rs_key->getValue(0)
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<< "' on table '"
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<< parsed_table_
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<< "' is not a valid integer primary key field\n";
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throw mapnik::datasource_exception(err.str());
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}
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}
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else if (result_rows > 1)
|
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{
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std::ostringstream err;
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err << "PostGIS Plugin: Error: '"
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<< "multi column primary key detected but is not supported";
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throw mapnik::datasource_exception(err.str());
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}
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}
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rs_key->close();
|
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}
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|
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// if a globally unique key field/primary key is required
|
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// but still not known at this point, then throw
|
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if (*autodetect_key_field && key_field_.empty())
|
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{
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throw mapnik::datasource_exception(
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"PostGIS Plugin: Error: primary key required"
|
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" but could not be detected for table '"
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+ parsed_table_ + "', please supply 'key_field'"
|
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" option to specify field to use for primary key");
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}
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|
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if (srid_ == 0)
|
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{
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srid_ = -1;
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MAPNIK_LOG_DEBUG(pgraster) << "pgraster_datasource: Table " << table_ << " is using SRID=" << srid_;
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}
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|
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// At this point the raster_field may still not be known
|
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// but we'll catch that where more useful...
|
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MAPNIK_LOG_DEBUG(pgraster) << "pgraster_datasource: Using SRID=" << srid_;
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MAPNIK_LOG_DEBUG(pgraster) << "pgraster_datasource: Using geometry_column=" << geometryColumn_;
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|
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// collect attribute desc
|
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#ifdef MAPNIK_STATS
|
|
mapnik::progress_timer __stats2__(std::clog, "pgraster_datasource::bind(get_column_description)");
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#endif
|
|
|
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std::ostringstream s;
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s << "SELECT * FROM " << populate_tokens(table_) << " LIMIT 0";
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|
|
|
shared_ptr<ResultSet> rs = conn->executeQuery(s.str());
|
|
int count = rs->getNumFields();
|
|
bool found_key_field = false;
|
|
for (int i = 0; i < count; ++i)
|
|
{
|
|
std::string fld_name = rs->getFieldName(i);
|
|
int type_oid = rs->getTypeOID(i);
|
|
|
|
// validate type of key_field
|
|
if (! found_key_field && ! key_field_.empty() && fld_name == key_field_)
|
|
{
|
|
if (type_oid == 20 || type_oid == 21 || type_oid == 23)
|
|
{
|
|
found_key_field = true;
|
|
desc_.add_descriptor(attribute_descriptor(fld_name, mapnik::Integer));
|
|
}
|
|
else
|
|
{
|
|
std::ostringstream error_s;
|
|
error_s << "invalid type '";
|
|
|
|
std::ostringstream type_s;
|
|
type_s << "SELECT oid, typname FROM pg_type WHERE oid = " << type_oid;
|
|
|
|
shared_ptr<ResultSet> rs_oid = conn->executeQuery(type_s.str());
|
|
if (rs_oid->next())
|
|
{
|
|
error_s << rs_oid->getValue("typname")
|
|
<< "' (oid:" << rs_oid->getValue("oid") << ")";
|
|
}
|
|
else
|
|
{
|
|
error_s << "oid:" << type_oid << "'";
|
|
}
|
|
|
|
rs_oid->close();
|
|
error_s << " for key_field '" << fld_name << "' - "
|
|
<< "must be an integer primary key";
|
|
|
|
rs->close();
|
|
throw mapnik::datasource_exception(error_s.str());
|
|
}
|
|
}
|
|
else
|
|
{
|
|
switch (type_oid)
|
|
{
|
|
case 16: // bool
|
|
desc_.add_descriptor(attribute_descriptor(fld_name, mapnik::Boolean));
|
|
break;
|
|
case 20: // int8
|
|
case 21: // int2
|
|
case 23: // int4
|
|
desc_.add_descriptor(attribute_descriptor(fld_name, mapnik::Integer));
|
|
break;
|
|
case 700: // float4
|
|
case 701: // float8
|
|
case 1700: // numeric
|
|
desc_.add_descriptor(attribute_descriptor(fld_name, mapnik::Double));
|
|
break;
|
|
case 1042: // bpchar
|
|
case 1043: // varchar
|
|
case 25: // text
|
|
case 705: // literal
|
|
desc_.add_descriptor(attribute_descriptor(fld_name, mapnik::String));
|
|
break;
|
|
default: // should not get here
|
|
#ifdef MAPNIK_LOG
|
|
s.str("");
|
|
s << "SELECT oid, typname FROM pg_type WHERE oid = " << type_oid;
|
|
|
|
shared_ptr<ResultSet> rs_oid = conn->executeQuery(s.str());
|
|
if (rs_oid->next())
|
|
{
|
|
std::string typname(rs_oid->getValue("typname"));
|
|
if (typname != "geometry" && typname != "raster")
|
|
{
|
|
MAPNIK_LOG_WARN(pgraster) << "pgraster_datasource: Unknown type=" << typname
|
|
<< " (oid:" << rs_oid->getValue("oid") << ")";
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MAPNIK_LOG_WARN(pgraster) << "pgraster_datasource: Unknown type_oid=" << type_oid;
|
|
}
|
|
rs_oid->close();
|
|
#endif
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
rs->close();
|
|
}
|
|
|
|
// Close explicitly the connection so we can 'fork()' without sharing open connections
|
|
conn->close();
|
|
}
|
|
|
|
pgraster_datasource::~pgraster_datasource()
|
|
{
|
|
if (! persist_connection_)
|
|
{
|
|
CnxPool_ptr pool = ConnectionManager::instance().getPool(creator_.id());
|
|
if (pool)
|
|
{
|
|
try {
|
|
shared_ptr<Connection> conn = pool->borrowObject();
|
|
if (conn)
|
|
{
|
|
conn->close();
|
|
}
|
|
} catch (mapnik::datasource_exception const& ex) {
|
|
// happens when borrowObject tries to
|
|
// create a new connection and fails.
|
|
// In turn, new connection would be needed
|
|
// when our broke and was thus no good to
|
|
// be borrowed
|
|
// See https://github.com/mapnik/mapnik/issues/2191
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
const char * pgraster_datasource::name()
|
|
{
|
|
return "pgraster";
|
|
}
|
|
|
|
mapnik::datasource::datasource_t pgraster_datasource::type() const
|
|
{
|
|
return type_;
|
|
}
|
|
|
|
layer_descriptor pgraster_datasource::get_descriptor() const
|
|
{
|
|
return desc_;
|
|
}
|
|
|
|
std::string pgraster_datasource::sql_bbox(box2d<double> const& env) const
|
|
{
|
|
std::ostringstream b;
|
|
b.precision(16);
|
|
b << "ST_MakeEnvelope(";
|
|
b << env.minx() << "," << env.miny() << ",";
|
|
b << env.maxx() << "," << env.maxy() << ",";
|
|
b << std::max(srid_, 0) << ")";
|
|
return b.str();
|
|
}
|
|
|
|
std::string pgraster_datasource::populate_tokens(std::string const& sql) const
|
|
{
|
|
return populate_tokens(sql, FLT_MAX,
|
|
box2d<double>(-FLT_MAX, -FLT_MAX, FLT_MAX, FLT_MAX),
|
|
0, 0, mapnik::attributes{}, false);
|
|
}
|
|
|
|
std::string pgraster_datasource::populate_tokens(std::string const& sql,
|
|
double scale_denom,
|
|
box2d<double> const& env,
|
|
double pixel_width,
|
|
double pixel_height,
|
|
mapnik::attributes const& vars,
|
|
bool intersect) const
|
|
{
|
|
std::ostringstream populated_sql;
|
|
std::cmatch m;
|
|
char const* start = sql.data();
|
|
char const* end = start + sql.size();
|
|
|
|
populated_sql.precision(16);
|
|
populated_sql << std::showpoint;
|
|
|
|
while (std::regex_search(start, end, m, re_tokens_))
|
|
{
|
|
populated_sql.write(start, m[0].first - start);
|
|
start = m[0].second;
|
|
|
|
auto m1 = boost::make_iterator_range(m[1].first, m[1].second);
|
|
if (m1.front() == '@')
|
|
{
|
|
std::string var_name(m1.begin() + 1, m1.end());
|
|
auto itr = vars.find(var_name);
|
|
if (itr != vars.end())
|
|
{
|
|
auto var_value = itr->second.to_string();
|
|
populated_sql << literal(var_value);
|
|
}
|
|
else
|
|
{
|
|
populated_sql << "NULL"; // undefined @variable
|
|
}
|
|
}
|
|
else if (boost::algorithm::equals(m1, "bbox"))
|
|
{
|
|
populated_sql << sql_bbox(env);
|
|
intersect = false;
|
|
}
|
|
else if (boost::algorithm::equals(m1, "pixel_height"))
|
|
{
|
|
populated_sql << pixel_height;
|
|
}
|
|
else if (boost::algorithm::equals(m1, "pixel_width"))
|
|
{
|
|
populated_sql << pixel_width;
|
|
}
|
|
else if (boost::algorithm::equals(m1, "scale_denominator"))
|
|
{
|
|
populated_sql << scale_denom;
|
|
}
|
|
else
|
|
{
|
|
populated_sql << "NULL"; // unrecognized !token!
|
|
}
|
|
}
|
|
|
|
populated_sql.write(start, end - start);
|
|
|
|
if (intersect)
|
|
{
|
|
if (intersect_min_scale_ > 0 && (scale_denom <= intersect_min_scale_))
|
|
{
|
|
populated_sql << " WHERE ST_Intersects("
|
|
<< identifier(geometryColumn_) << ", "
|
|
<< sql_bbox(env) << ")";
|
|
}
|
|
else if (intersect_max_scale_ > 0 && (scale_denom >= intersect_max_scale_))
|
|
{
|
|
// do no bbox restriction
|
|
}
|
|
else
|
|
{
|
|
populated_sql << " WHERE "
|
|
<< identifier(geometryColumn_) << " && "
|
|
<< sql_bbox(env);
|
|
}
|
|
}
|
|
|
|
return populated_sql.str();
|
|
}
|
|
|
|
|
|
std::shared_ptr<IResultSet> pgraster_datasource::get_resultset(std::shared_ptr<Connection> &conn, std::string const& sql, CnxPool_ptr const& pool, processor_context_ptr ctx) const
|
|
{
|
|
|
|
if (!ctx)
|
|
{
|
|
// ! asynchronous_request_
|
|
if (cursor_fetch_size_ > 0)
|
|
{
|
|
// cursor
|
|
std::ostringstream csql;
|
|
std::string cursor_name = conn->new_cursor_name();
|
|
|
|
csql << "DECLARE " << cursor_name << " BINARY INSENSITIVE NO SCROLL CURSOR WITH HOLD FOR " << sql << " FOR READ ONLY";
|
|
|
|
if (! conn->execute(csql.str()))
|
|
{
|
|
// TODO - better error
|
|
throw mapnik::datasource_exception("Pgraster Plugin: error creating cursor for data select." );
|
|
}
|
|
|
|
return std::make_shared<CursorResultSet>(conn, cursor_name, cursor_fetch_size_);
|
|
|
|
}
|
|
else
|
|
{
|
|
// no cursor
|
|
return conn->executeQuery(sql, 1);
|
|
}
|
|
}
|
|
else
|
|
{ // asynchronous requests
|
|
|
|
std::shared_ptr<postgis_processor_context> pgis_ctxt = std::static_pointer_cast<postgis_processor_context>(ctx);
|
|
if (conn)
|
|
{
|
|
// lauch async req & create asyncresult with conn
|
|
conn->executeAsyncQuery(sql, 1);
|
|
return std::make_shared<AsyncResultSet>(pgis_ctxt, pool, conn, sql);
|
|
}
|
|
else
|
|
{
|
|
// create asyncresult with null connection
|
|
std::shared_ptr<AsyncResultSet> res = std::make_shared<AsyncResultSet>(pgis_ctxt, pool, conn, sql);
|
|
pgis_ctxt->add_request(res);
|
|
return res;
|
|
}
|
|
}
|
|
}
|
|
|
|
processor_context_ptr pgraster_datasource::get_context(feature_style_context_map & ctx) const
|
|
{
|
|
if (!asynchronous_request_)
|
|
{
|
|
return processor_context_ptr();
|
|
}
|
|
|
|
std::string ds_name(name());
|
|
feature_style_context_map::const_iterator itr = ctx.find(ds_name);
|
|
if (itr != ctx.end())
|
|
{
|
|
return itr->second;
|
|
}
|
|
else
|
|
{
|
|
return ctx.insert(std::make_pair(ds_name,std::make_shared<postgis_processor_context>())).first->second;
|
|
}
|
|
}
|
|
|
|
featureset_ptr pgraster_datasource::features(query const& q) const
|
|
{
|
|
// if the driver is in asynchronous mode, return the appropriate fetaures
|
|
if (asynchronous_request_ )
|
|
{
|
|
return features_with_context(q,std::make_shared<postgis_processor_context>());
|
|
}
|
|
else
|
|
{
|
|
return features_with_context(q,processor_context_ptr());
|
|
}
|
|
}
|
|
|
|
featureset_ptr pgraster_datasource::features_with_context(query const& q,processor_context_ptr proc_ctx) const
|
|
{
|
|
|
|
#ifdef MAPNIK_STATS
|
|
mapnik::progress_timer __stats__(std::clog, "pgraster_datasource::features_with_context");
|
|
#endif
|
|
|
|
|
|
box2d<double> const& box = q.get_bbox();
|
|
double scale_denom = q.scale_denominator();
|
|
|
|
CnxPool_ptr pool = ConnectionManager::instance().getPool(creator_.id());
|
|
|
|
if (pool)
|
|
{
|
|
shared_ptr<Connection> conn;
|
|
|
|
if ( asynchronous_request_ )
|
|
{
|
|
// limit use to num_async_request_ => if reached don't borrow the last connexion object
|
|
std::shared_ptr<postgis_processor_context> pgis_ctxt = std::static_pointer_cast<postgis_processor_context>(proc_ctx);
|
|
if ( pgis_ctxt->num_async_requests_ < max_async_connections_ )
|
|
{
|
|
conn = pool->borrowObject();
|
|
pgis_ctxt->num_async_requests_++;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// Always get a connection in synchronous mode
|
|
conn = pool->borrowObject();
|
|
if(!conn )
|
|
{
|
|
throw mapnik::datasource_exception("Pgraster Plugin: Null connection");
|
|
}
|
|
}
|
|
|
|
|
|
if (geometryColumn_.empty())
|
|
{
|
|
std::ostringstream s_error;
|
|
s_error << "PostGIS: geometry name lookup failed for table '";
|
|
|
|
if (!parsed_schema_.empty())
|
|
{
|
|
s_error << parsed_schema_ << ".";
|
|
}
|
|
s_error << parsed_table_
|
|
<< "'. Please manually provide the 'raster_field' parameter or add an entry "
|
|
<< "in the geometry_columns for '";
|
|
|
|
if (!parsed_schema_.empty())
|
|
{
|
|
s_error << parsed_schema_ << ".";
|
|
}
|
|
s_error << parsed_table_ << "'.";
|
|
|
|
throw mapnik::datasource_exception(s_error.str());
|
|
}
|
|
|
|
const double px_gw = 1.0 / std::get<0>(q.resolution());
|
|
const double px_gh = 1.0 / std::get<1>(q.resolution());
|
|
|
|
MAPNIK_LOG_DEBUG(pgraster) << "pgraster_datasource: px_gw=" << px_gw
|
|
<< " px_gh=" << px_gh;
|
|
|
|
std::string table_with_bbox;
|
|
std::string col = geometryColumn_;
|
|
table_with_bbox = table_; // possibly a subquery
|
|
|
|
if ( use_overviews_ && !overviews_.empty()) {
|
|
std::string sch = overviews_[0].schema;
|
|
std::string tab = overviews_[0].table;
|
|
col = overviews_[0].column;
|
|
const double scale = std::min(px_gw, px_gh);
|
|
std::vector<pgraster_overview>::const_reverse_iterator i;
|
|
for (i=overviews_.rbegin(); i!=overviews_.rend(); ++i) {
|
|
const pgraster_overview& o = *i;
|
|
if ( o.scale < scale ) {
|
|
sch = o.schema;
|
|
tab = o.table;
|
|
col = o.column;
|
|
MAPNIK_LOG_DEBUG(pgraster)
|
|
<< "pgraster_datasource: using overview "
|
|
<< o.schema << "." << o.table << "." << o.column
|
|
<< " with scale=" << o.scale
|
|
<< " for min out scale=" << scale;
|
|
break;
|
|
} else {
|
|
MAPNIK_LOG_DEBUG(pgraster)
|
|
<< "pgraster_datasource: overview "
|
|
<< o.schema << "." << o.table << "." << o.column
|
|
<< " with scale=" << o.scale
|
|
<< " not good for min out scale " << scale;
|
|
}
|
|
}
|
|
boost::algorithm::replace_all(table_with_bbox, parsed_table_, tab);
|
|
boost::algorithm::replace_all(table_with_bbox, parsed_schema_, sch);
|
|
boost::algorithm::replace_all(table_with_bbox, geometryColumn_, col);
|
|
}
|
|
table_with_bbox = populate_tokens(table_with_bbox, scale_denom, box,
|
|
px_gw, px_gh, q.variables());
|
|
|
|
std::ostringstream s;
|
|
|
|
s << "SELECT ST_AsBinary(";
|
|
|
|
if (band_) s << "ST_Band(";
|
|
|
|
if (prescale_rasters_) s << "ST_Resize(";
|
|
|
|
if (clip_rasters_) s << "ST_Clip(";
|
|
|
|
s << identifier(col);
|
|
|
|
if (clip_rasters_) {
|
|
s << ", ST_Expand(" << sql_bbox(box)
|
|
<< ", greatest(abs(ST_ScaleX("
|
|
<< identifier(col) << ")), abs(ST_ScaleY("
|
|
<< identifier(col) << ")))))";
|
|
}
|
|
|
|
if (prescale_rasters_) {
|
|
const double scale = std::min(px_gw, px_gh);
|
|
s << ", least(1.0, abs(ST_ScaleX(" << identifier(col)
|
|
<< "))::float8/" << scale
|
|
<< "), least(1.0, abs(ST_ScaleY(" << identifier(col)
|
|
<< "))::float8/" << scale << "))";
|
|
// TODO: if band_ is given, we'll interpret as indexed so
|
|
// the rescaling must NOT ruin it (use algorithm mode!)
|
|
}
|
|
|
|
if (band_) s << ", " << band_ << ")";
|
|
|
|
s << ") AS geom";
|
|
|
|
mapnik::context_ptr ctx = std::make_shared<mapnik::context_type>();
|
|
std::set<std::string> const& props = q.property_names();
|
|
std::set<std::string>::const_iterator pos = props.begin();
|
|
std::set<std::string>::const_iterator end = props.end();
|
|
|
|
if (! key_field_.empty())
|
|
{
|
|
s << ',' << identifier(key_field_);
|
|
ctx->push(key_field_);
|
|
|
|
for (; pos != end; ++pos)
|
|
{
|
|
if (*pos != key_field_)
|
|
{
|
|
s << ',' << identifier(*pos);
|
|
ctx->push(*pos);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (; pos != end; ++pos)
|
|
{
|
|
s << ',' << identifier(*pos);
|
|
ctx->push(*pos);
|
|
}
|
|
}
|
|
|
|
s << " FROM " << table_with_bbox;
|
|
|
|
if (row_limit_ > 0)
|
|
{
|
|
s << " LIMIT " << row_limit_;
|
|
}
|
|
|
|
MAPNIK_LOG_DEBUG(pgraster) << "pgraster_datasource: "
|
|
"features query: " << s.str();
|
|
|
|
std::shared_ptr<IResultSet> rs = get_resultset(conn, s.str(), pool, proc_ctx);
|
|
return std::make_shared<pgraster_featureset>(rs, ctx,
|
|
desc_.get_encoding(), !key_field_.empty(),
|
|
band_ ? 1 : 0 // whatever band number is given we'd have
|
|
// extracted with ST_Band above so it becomes
|
|
// band number 1
|
|
);
|
|
|
|
}
|
|
|
|
return mapnik::make_invalid_featureset();
|
|
}
|
|
|
|
|
|
featureset_ptr pgraster_datasource::features_at_point(coord2d const& pt, double tol) const
|
|
{
|
|
#ifdef MAPNIK_STATS
|
|
mapnik::progress_timer __stats__(std::clog, "pgraster_datasource::features_at_point");
|
|
#endif
|
|
CnxPool_ptr pool = ConnectionManager::instance().getPool(creator_.id());
|
|
if (pool)
|
|
{
|
|
shared_ptr<Connection> conn = pool->borrowObject();
|
|
if (!conn) return mapnik::make_invalid_featureset();
|
|
|
|
if (conn->isOK())
|
|
{
|
|
if (geometryColumn_.empty())
|
|
{
|
|
std::ostringstream s_error;
|
|
s_error << "PostGIS: geometry name lookup failed for table '";
|
|
|
|
if (!parsed_schema_.empty())
|
|
{
|
|
s_error << parsed_schema_ << ".";
|
|
}
|
|
s_error << parsed_table_
|
|
<< "'. Please manually provide the 'raster_field' parameter or add an entry "
|
|
<< "in the geometry_columns for '";
|
|
|
|
if (!parsed_schema_.empty())
|
|
{
|
|
s_error << parsed_schema_ << ".";
|
|
}
|
|
s_error << parsed_table_ << "'.";
|
|
|
|
throw mapnik::datasource_exception(s_error.str());
|
|
}
|
|
|
|
std::ostringstream s;
|
|
s << "SELECT ST_AsBinary(" << identifier(geometryColumn_) << ") AS geom";
|
|
|
|
mapnik::context_ptr ctx = std::make_shared<mapnik::context_type>();
|
|
auto const& desc = desc_.get_descriptors();
|
|
|
|
if (!key_field_.empty())
|
|
{
|
|
s << ',' << identifier(key_field_);
|
|
ctx->push(key_field_);
|
|
for (auto const& attr_info : desc)
|
|
{
|
|
std::string const& name = attr_info.get_name();
|
|
if (name != key_field_)
|
|
{
|
|
s << ',' << identifier(name);
|
|
ctx->push(name);
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (auto const& attr_info : desc)
|
|
{
|
|
std::string const& name = attr_info.get_name();
|
|
s << ',' << identifier(name);
|
|
ctx->push(name);
|
|
}
|
|
}
|
|
|
|
box2d<double> box(pt.x - tol, pt.y - tol, pt.x + tol, pt.y + tol);
|
|
std::string table_with_bbox = populate_tokens(table_, FLT_MAX, box, 0, 0,
|
|
mapnik::attributes{});
|
|
|
|
s << " FROM " << table_with_bbox;
|
|
|
|
if (row_limit_ > 0)
|
|
{
|
|
s << " LIMIT " << row_limit_;
|
|
}
|
|
|
|
std::shared_ptr<IResultSet> rs = get_resultset(conn, s.str(), pool);
|
|
return std::make_shared<pgraster_featureset>(rs, ctx, desc_.get_encoding(), !key_field_.empty());
|
|
}
|
|
}
|
|
|
|
return mapnik::make_invalid_featureset();
|
|
}
|
|
|
|
box2d<double> pgraster_datasource::envelope() const
|
|
{
|
|
if (extent_initialized_)
|
|
{
|
|
return extent_;
|
|
}
|
|
|
|
CnxPool_ptr pool = ConnectionManager::instance().getPool(creator_.id());
|
|
if (pool)
|
|
{
|
|
shared_ptr<Connection> conn = pool->borrowObject();
|
|
if (!conn) return extent_;
|
|
if (conn->isOK())
|
|
{
|
|
std::ostringstream s;
|
|
|
|
std::string col = geometryColumn_;
|
|
std::string sch = parsed_schema_;
|
|
std::string tab = parsed_table_;
|
|
|
|
if ( ! overviews_.empty() )
|
|
{
|
|
// query from highest-factor overview instead
|
|
const pgraster_overview& o = overviews_.back();
|
|
sch = o.schema;
|
|
tab = o.table;
|
|
col = o.column;
|
|
}
|
|
|
|
if (col.empty())
|
|
{
|
|
std::ostringstream s_error;
|
|
s_error << "PostGIS: unable to query the layer extent of table '";
|
|
|
|
if (! sch.empty())
|
|
{
|
|
s_error << sch << ".";
|
|
}
|
|
s_error << parsed_table_ << "' because we cannot determine the raster field name."
|
|
<< "\nPlease provide either an 'extent' parameter to skip this query, "
|
|
<< "a 'raster_field' and/or 'raster_table' parameter, or add "
|
|
<< "standard constraints to your raster table.";
|
|
|
|
throw mapnik::datasource_exception("Pgraster Plugin: " + s_error.str());
|
|
}
|
|
|
|
if (estimate_extent_)
|
|
{
|
|
if (tab.empty())
|
|
{
|
|
std::ostringstream s_error;
|
|
s_error << "PostGIS: unable to query the layer extent as "
|
|
<< "we couldn't determine the raster table name.\n"
|
|
<< "Please provide either an 'extent' parameter to skip this query, "
|
|
<< "a 'raster_table' parameter, or do not set 'estimate_extent'";
|
|
throw mapnik::datasource_exception("Pgraster Plugin: " + s_error.str());
|
|
}
|
|
s << "SELECT ST_XMin(ext),ST_YMin(ext),ST_XMax(ext),ST_YMax(ext)"
|
|
<< " FROM (SELECT ST_EstimatedExtent(";
|
|
|
|
if (! sch.empty())
|
|
{
|
|
s << literal(sch) << ',';
|
|
}
|
|
|
|
s << literal(tab) << ','
|
|
<< literal(col) << ") as ext) as tmp";
|
|
}
|
|
else
|
|
{
|
|
s << "SELECT ST_XMin(ext),ST_YMin(ext),ST_XMax(ext),ST_YMax(ext)"
|
|
<< " FROM (SELECT ST_Extent(" << identifier(col) << "::geometry) as ext from ";
|
|
|
|
if (extent_from_subquery_)
|
|
{
|
|
// if a subselect limits records then calculating the extent upon the
|
|
// subquery will be faster and the bounds will be more accurate
|
|
s << populate_tokens(table_) << ") as tmpx";
|
|
}
|
|
else
|
|
{
|
|
if (! sch.empty())
|
|
{
|
|
s << identifier(sch) << ".";
|
|
}
|
|
|
|
// but if the subquery does not limit records then querying the
|
|
// actual table will be faster as indexes can be used
|
|
s << identifier(tab) << ") as tmp";
|
|
}
|
|
}
|
|
|
|
shared_ptr<ResultSet> rs = conn->executeQuery(s.str());
|
|
if (rs->next() && ! rs->isNull(0))
|
|
{
|
|
double lox, loy, hix, hiy;
|
|
if (mapnik::util::string2double(rs->getValue(0), lox) &&
|
|
mapnik::util::string2double(rs->getValue(1), loy) &&
|
|
mapnik::util::string2double(rs->getValue(2), hix) &&
|
|
mapnik::util::string2double(rs->getValue(3), hiy))
|
|
{
|
|
extent_.init(lox, loy, hix, hiy);
|
|
extent_initialized_ = true;
|
|
}
|
|
else
|
|
{
|
|
MAPNIK_LOG_DEBUG(pgraster) << "pgraster_datasource: Could not determine extent from query: " << s.str();
|
|
}
|
|
}
|
|
rs->close();
|
|
}
|
|
}
|
|
|
|
return extent_;
|
|
}
|
|
|
|
boost::optional<mapnik::datasource_geometry_t> pgraster_datasource::get_geometry_type() const
|
|
{
|
|
return boost::optional<mapnik::datasource_geometry_t>();
|
|
}
|